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This paper presents the architecture and implementation of our prototype EtE monitor. It also highlights the benefits of our approach through an eval-uation of the performance of three different commercial Web sites using EtE monitor. Overall, we believe that detailed performance information will enable network services to dynamically adapt to changing access patterns and system characteristics to best match client QoS expectations. A key challenge to exter-nal evaluation of dynamic and personalized Web services is subjecting them to dynamic request streams that accurately reflect complex client interactions and the resulting computation across multiple tiers. While Web page instrumenta-tion does allow evaluation under realistic access patterns, it remains difficult to break down network versus computation bottlenecks using this approach.
Approximate Word count = 425
Approximate Pages = 1.7
(250 words per page double spaced)
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